Pump motor



J. A. SPEARS Sept. 2 v1924.

PUMP MOTOR Filed sept. 1o. 192x ATTORNEY.

Patented Sept. 2, 1924.

UNITED STATESy PATENT omer..

JOHN A. srEARsor GROVE Orrin-PENNSYLVANIA.

PUMPl MOTOR.

Appnca'timi filed september 1o, 1921. 'seran No. 499,758.

To all whom t may concern:

Be it known that I, JOHN A. SPEARS, a citizen of the United States,residing at IGrove City, in the county of Mercer and State ofPennsylvania, have invented new and useful Improvements in Pump Motors,of which the following is a speciiication.

The invention is directed to the valve mechanism of the pump motor.Heretofore there has been a pump known as the Cam! Inv eron pump ofquite wide distribution. it the valve is reversed by the action of thepiston on a reversing valve. The valve motor is arranged in the steamchest and ordinarily has steam under pressure on the ends of the pistonof the valve mot-or and the movement of the vvalve motor is accomplishedby exhausting the steam from one end and the main valve moves in thelop? By this construction the mechanism as aV whole is somewhatsimplified and in addition the action of the valve is rendered moreJcpositive. f

The invention is illustrated in thel accompanying drawings as followsFig. 1 shows a 'plan view ofthe floorV of the steam chest showing theports and valve surface thereon.

Fig. 2 an end view of the cylinder withv the valve cage and cylinderhead removed.

Fig. 3 a section on the line 3-'3 in Figs. 1 and 2. p

Fig. 4 an end view of the cylinder.

Fig. 5 a section on the line 5-5 in Fig. 3.

Fig. 6 a section of the valve cage on the line 3-3 in Fig. 4, the valvecase being in elevation. f

Fig. 7 a section of the valve case.

Fig. 8 an end view of the valve case removed.

Fig. 9 a section on the line 9-v-9 in Fig.' 7.

Fig. 10 a section similar -to Fig. 7 with the controlling valve inreverse position from that of Fig. 7.

` chamber 27a 1 marks the cylinder,2 the piston, 3 the steam chest, 4the valve seat, 5 the exhaust port leading from the seat, 6 the inletports leading from the valve seat, 7 the main valve this being of theordinary D-'valve type, 8 a valve motor piston, and 9'Icylindersarranged in the steam chestr in which the valve motor piston operates.

A valve cage 10 is formed on a cylinderl head l11. Avalve case 12 isarranged in the valve cage, the end of the cage being closed by a plug10?. The valve case has an portion which is screwed into a screwthreadedopening 14 in the cage 10 by means of which the Vcase may be forced upagainst a shoulder 15 at the inner end of the cage. Pins 16 are providedforming a wrench-hold by means of which the case may be readily turned.

The valve case has a cylindrical eoy extension 13 terminating in ascrew-threaded i opening 17. A poppet valve 18 operates'ony a seat 19 atthe end of the opening through the seat leading into the cylindricalopening 17 The valve 18 has a stem 20, this `being rectangular so as toform passages between it and the cylindrical walls 17. A cylindricalvalve 21 forms a closure t with the cylinder wall 17 ,l this valve beingsecured to the stem 20. The plunger valve 21'moves'into a chamber 22case 12 thev y when the valve 18 is closed at the front end of the case12. chamber 22 to a passage 24 in the front of the cage from which aport 25 leads to thel exhaust Vport 5. A port 26 leads from the endofthe cage 10between the case'12 and the plug 10a to the steam chest. Aport 27 leads from the end ofthe cylinder 9 to a formed in the lcagearound the oase. The chamber 27 communicates through a port 27b with thecylinder 17 at a point between the valve 18 and valve 21.V

A pin 28 extends from the valve 21 through the case and ,extension 13into thecylinder 1 and into the path of the piston 2. These valvemechanisms and ports are duplicated at both ends of the pump motor.

The'joperation of the device'is as follows:

The controlling valve is shown in its normal position in Fig. 10. Hereit will be noted that the valve 18-is closed and is subjected to livesteam pressure carried into the cage at the rear of the valve by way ofthe port 26. The cylinderv 9 is in communication with the exhaust bywayk ofthe ports 27, 27h,

the cylinder 17, chamber 22, passage 23 and Openings 23 extend from theyport 25. lVhen the piston strikes the stem 28 it forces the valve 21into the cylinder 17, thus closing off the connection between thecylinder 9 and the exhaust and at the same time opens the valve 18permit-ting steam to enter from the cage, the steam Apassing through theopenings at the sides of the stem 20 and out through the port 27",chamber 27a, and port 27 to the end of the cylinder 9. The oppositeend.of the piston 8 being subjected only to exhaust ypressure inimediatelymoves under the influenceof this pressure reversing the D-valve 7 andadmitting steam on the face of the piston engaging the stem 28. As thepiston reverses its movement the stem 28 follows up, .thus closing thevalve 18 and opening the valve 21. Thus steam is cut 0H from the end ofthe cylinder 9 and the end of the cylinder in which there is steam underpressure is ex'- hausted so that the two cylinders 9 are normally underexhaust pressure. Thus a positive action of the main valve is broughtabout and if there is any leakage of the valve motor pistons thisleakage does not interfere with the correct operation of the' valve.

lVhat I claim as new is:

l. In a pump motor, the combination of a cylinder; a piston in thecylinder; a main valve controlling the flow of motive fluid to thecylinder; a valve motor actuating the valve having its movable elementnormally connected to an exhaust; and means comprising a valve mechanismactuated by the piston for admitting fluid under pressure momentarily toone side of the movable element to actuate the valve motor.

2. In a pump motor, the combination of a cylinder; a piston in thecylinder; a main valve controlling the flow of motive iiuid to thecylinder; a valve motor actuating the valve having its movable elementnormally connected to an exhaust; and means vcomprising a valvemechanism actuated by the piston for admitting fluid under pressuremomentarily to one side of the movable element to actuate the valvemotor in a direction which is followed by the main piston in response tothe movement of the main valve.

3. In a pump motor, the combinationof a cylinder; piston in thecylinder; a main valve controlling the flow of motive fluid to thecylinder; a valve motor actuating the main valve: a valve mechanismcontrolling the valve motor comprising a valve case having exhaust andinlet valves working alternately; a pressure fluid connection to theinlet valve an exhaust connection leading'from the exhaust valve; land aconnection leading from between the valves to the motor.

4. In a pump motor, the combination of a cylinder; a piston in thecylinder; a main valve controlling the flow of motive fluid to thecylinder; a valve motor actuating lthe main valve; a valve mechanismcontrolling the valve motor comprisingza valve case having a plungerexhaust valve and a poppet inlet valve, said valves working alternately;a pressure liuid connection to the inlet valve; an exhaust connectionleading from the exhaust valve; and a connection leading from betweenthe valves to the motor.

5. In a pump motor, the combination of a cylinder; a piston in thecylinder; a Vmain valve controlling the flow of motive fluid to thecylinder; a valve motor actuating the mainv valve; a valve mechanismcontrolling the valve motor comprising :a valve case having exhaust andinlet valves working alternately; a pressure fluid connection to theinlet valve; an exhaust connection leading from the vexhaust valve; aconnection leading `from between the valves to .the motor; and a tappetin the path of the piston actuating said valves.

.6. In a pump motor, the combination of a cylinder; 'a piston in thecylinder; a main valve controlling the flow `of motive fluid to thecylinder; a valve motor actuating the main valve; a valve Lmechanismcontrolling the valve motor comprising a valve case having exhaust andinlet valves wor-king alternately; a pressure fluid connection to theinlet valve; an exhaust connection leading from the exhaust valve; aconnection leading from between the valves to kthe motor; and a tappetin the path of the piston actuatinOp said valves the fluid ressureclosino' the inlet valve and opening the. exhaust` valve when thetappets are released.

7 In a pump motor, the combination of a cylinder; ya piston operating inthe cylinder; a main valve controlling the pump motor; a valve motoi`controlling the main valve; a valve mechanism controlling the valvemotor comprising a valve cage having a connection to the valve motor, aconnection to the exhaust, and a connection to the motive fluid; a valvecase in the valve cage seating in the cage and forming a passagelead-ing to the exhaust connection; a chamber to vwhich the connectionfrom the valve motor leads; a chamber to which the connection for themotive Vfluid leads, said case having `a seat at it send, a cylindertherein, and a chamber leading from the cylinder; a poppet valveoperating er valve connected with the poppet valve operating in thecylinder, the plunger valve forming a closure with the opening of the lpoppet valvev and passing into the chamber and connecting the exhaustand valve motor connections; and a tappet leading from the valve in thepath .of the piston.

In testimony whereof I have hereunto set my hand.

JOHN. A. SPEARS.

llO

on the seat; a plung-

